Question
A ratio named for this process is approximately 10-to-1 for internal combustion engines, but 20-to-1 for diesel engines. For 10 points each:
[10m] Name this process that occurs in the third and fourth stages of the Carnot cycle. Diesel engines use this process instead of spark plugs to ignite fuel.
ANSWER: compression [accept word forms describing compressing air]
[10e] Air is compressed in engines by the strokes of these devices. V8 engines are named for having eight of these devices arranged in a “V” shape.
ANSWER: pistons
[10h] An engine’s compression ratio is calculated from combustion chamber volumes when the piston is at “top” and “bottom [this location].” This two-word term describes the upper and lower extents of a piston.
ANSWER: dead center [accept top dead center or bottom dead center; prompt on center]
<Benjamin Chapman, Science - Engineering and Miscellaneous> ~22113~ <Editor: David Bass>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2024 PACE NSC | 06/08/2024 | Y | 36 | 12.78 | 86% | 42% | 0% |